Censys expands queries to provide additional functionality. For example, the query a:zmap.io
executes a DNS lookup and expands to ip:18.104.22.168.
Your query was changed from:
parsed.tbs_noct_fingerprint: 5dd76543d08767b6bc5b1467cf1d584a90cad2027a6f3e184ecb86332420b361 and precert: true
parsed.tbs_noct_fingerprint: 5dd76543d08767b6bc5b1467cf1d584a90cad2027a6f3e184ecb86332420b361 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.